### Secure Cryptographic Workflow in the Standard Model

M. Barbosa and P. Farshim

##### Abstract

Following the work of Al-Riyami et al. we define the notion of key encapsulation mechanism supporting cryptographic workflow (WF-KEM) and prove a KEM-DEM composition theorem which extends the notion of hybrid encryption to cryptographic workflow. We then generically construct a WF-KEM from an identity-based encryption (IBE) scheme and a secret sharing scheme. Chosen ciphertext security is achieved using one-time signatures. Adding a public-key encryption scheme we are able to modify the construction to obtain escrow-freeness. We prove all our constructions secure in the standard model.

Note: This is the full version of the paper.

Available format(s)
Category
Public-key cryptography
Publication info
Published elsewhere. Indocrypt 2006
Keywords
Cryptographic WorkflowKey EncapsulationSecret SharingIdentity-Based Encryption.
Contact author(s)
farshim @ cs bris ac uk
History
Short URL
https://ia.cr/2006/450

CC BY

BibTeX

@misc{cryptoeprint:2006/450,
author = {M.  Barbosa and P.  Farshim},
title = {Secure Cryptographic Workflow in the Standard Model},
howpublished = {Cryptology ePrint Archive, Paper 2006/450},
year = {2006},
note = {\url{https://eprint.iacr.org/2006/450}},
url = {https://eprint.iacr.org/2006/450}
}

Note: In order to protect the privacy of readers, eprint.iacr.org does not use cookies or embedded third party content.